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        前端性能优化
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    <h2 id="什么是web性能"><a href="#什么是web性能" class="headerlink" title="什么是web性能"></a>什么是web性能</h2><p>性能简单来说就是网站够不够快：</p>
<ul>
<li>打开速度</li>
<li>动画效果</li>
<li>表单提交</li>
<li>列表切换</li>
<li>页面切换</li>
<li>…</li>
</ul>
<h2 id="Web-性能指标"><a href="#Web-性能指标" class="headerlink" title="Web 性能指标"></a>Web 性能指标</h2><h3 id="RAIL-性能模型"><a href="#RAIL-性能模型" class="headerlink" title="RAIL 性能模型"></a>RAIL 性能模型</h3><ul>
<li>R(Response) 响应</li>
<li>A(Animation)动画</li>
<li>I(Idle)空闲</li>
<li>L(Loading)加载</li>
</ul>
<h3 id="基于用户体验的性能指标"><a href="#基于用户体验的性能指标" class="headerlink" title="基于用户体验的性能指标"></a>基于用户体验的性能指标</h3><ul>
<li>First Content Paint (FCP) 首次内容绘制：<strong>首次绘制来自DOM的内容</strong>的时间</li>
<li>Largest Contentful Paint (LCP) 最大内容绘制：<strong>可视区域中最大的内容元素</strong>呈现到屏幕上的时间</li>
<li>First Input Delay (FID) 首次输入延迟：从用户第一次与页面交互（例如点击链接）到浏览器实际能够响应到该交互的时间</li>
<li>Time to Interactive (TTI) 网页第一次 <strong>完全可达到交互状态</strong> 的时间点：最后一个长任务 (long task) 完成的时间，并且随后五秒内网络和主线程是空闲的<ul>
<li>长任务指的是需要50毫秒以上才能完成的任务</li>
</ul>
</li>
<li>Total Block Time (TBT) <strong>总阻塞时间</strong>：度量了 FCP 和 TTI 之间的总时间</li>
<li>Cumulative Layout Shift (CLS) <strong>累计布局偏移</strong></li>
<li>Speed Index：速度指数，是一个表示页面可视区域中内容的<strong>填充速度</strong>的指标</li>
</ul>
<h3 id="Web-Vitals"><a href="#Web-Vitals" class="headerlink" title="Web Vitals"></a>Web Vitals</h3><blockquote>
<p>精简版的性能指标</p>
</blockquote>
<p>在 Web Vitals 中，Google 确定了三个主要衡量指标，即在所有类型的网站中通用的 Core Web Virtals</p>
<ul>
<li>加载性能 (LCP)</li>
<li>交互性 (FID)</li>
<li>视觉稳定性 (CLS)</li>
</ul>
<h2 id="Web-性能测试"><a href="#Web-性能测试" class="headerlink" title="Web 性能测试"></a>Web 性能测试</h2><ul>
<li>使用 灯塔 Lighthouse 测试性能<ul>
<li>通过监控和检测网站应用的各方面性能表现，来为开发者提供优化用户体验和网站性能的指导建议</li>
</ul>
</li>
<li>使用 WebPageTest 测试性能</li>
<li>使用 Chrome DevTools 测试性能<ul>
<li>Network 分析</li>
<li>Performance 面板</li>
<li>FPS 计数器</li>
</ul>
</li>
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      <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BB%80%E4%B9%88%E6%98%AFweb%E6%80%A7%E8%83%BD"><span class="toc-number">1.</span> <span class="toc-text">什么是web性能</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Web-%E6%80%A7%E8%83%BD%E6%8C%87%E6%A0%87"><span class="toc-number">2.</span> <span class="toc-text">Web 性能指标</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#RAIL-%E6%80%A7%E8%83%BD%E6%A8%A1%E5%9E%8B"><span class="toc-number">2.1.</span> <span class="toc-text">RAIL 性能模型</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%9F%BA%E4%BA%8E%E7%94%A8%E6%88%B7%E4%BD%93%E9%AA%8C%E7%9A%84%E6%80%A7%E8%83%BD%E6%8C%87%E6%A0%87"><span class="toc-number">2.2.</span> <span class="toc-text">基于用户体验的性能指标</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Web-Vitals"><span class="toc-number">2.3.</span> <span class="toc-text">Web Vitals</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Web-%E6%80%A7%E8%83%BD%E6%B5%8B%E8%AF%95"><span class="toc-number">3.</span> <span class="toc-text">Web 性能测试</span></a></li></ol>
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